package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoopingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Slf4j
@Service
public class ShoopingCartServiceImpI implements ShoopingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param dto
     */
    @Override
    public void add(ShoppingCartDTO dto) {
        ShoppingCart shoppingCart = new ShoppingCart();//创建了一个购物车对象，用来保存数据，方便后面传输到mapper保存到数据库
        BeanUtils.copyProperties(dto, shoppingCart);//使用BeanUtils.copyProperties(带数据的一方，需要拷贝的一方)
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());//使用threadLocal来获取到线程中的用户id为当前用户id

        //判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if (shoppingCartList != null && shoppingCartList.size() == 1) {
            //如果已经存在，就更新数量，数量加1
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        } else {
            //如果不存在，插入数据，数量就是1

            //判断当前添加到购物车的是菜品还是套餐
            Long dishId = dto.getDishId();
            if (dishId != null) {
                //添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                //添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(dto.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车
     *
     * @return
     */


    //查看购物车根据当前的登录用户id来查询数据
    @Override
    public List<ShoppingCart> list() {
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.listByUserId(BaseContext.getCurrentId());

        return shoppingCartList;
    }

    /**
     * 清空购物车
     */

    @Override
    public void clean() {
        //清空购物车根据当前登录的用户id来删除数据
        //获取到当前登录的用户id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(userId);
    }

    /**
     * 删除购物车中一个商品
     *
     * @param dto
     */

    @Override
    public void sub(ShoppingCartDTO dto) {

        // 设置当前用户ID
        ShoppingCart shoppingCart = new ShoppingCart();//创建了一个购物车对象，用来保存数据，方便后面传输到mapper保存到数据库
        BeanUtils.copyProperties(dto, shoppingCart);//将数据拷贝给shoppingCart
        shoppingCart.setUserId(BaseContext.getCurrentId());//为shoppingCart设置当前用户ID

        // 判断当前操作的是菜品还是套餐
        Long dishId = dto.getDishId();

        if (dishId != null) {
            // 处理菜品
            log.info("减少购物车中的菜品数量：{}", dto);

            // 查询购物车中该菜品的信息
            List<ShoppingCart> cartList = shoppingCartMapper.list(shoppingCart);
            if (cartList != null && !cartList.isEmpty()) {
                ShoppingCart cart = cartList.get(0);
                if (cart.getNumber() > 1) {
                    // 数量大于1，减少数量
                    cart.setNumber(cart.getNumber() - 1);
                    shoppingCartMapper.updateNumberById(cart);
                } else {
                    // 数量为1，直接删除
                    shoppingCartMapper.deleteBydishId(dto.getDishId());
                }
            }
        } else {
            // 处理套餐
            log.info("减少购物车中的套餐数量：{}", dto);

            // 查询购物车中该套餐的信息
            List<ShoppingCart> cartList = shoppingCartMapper.list(shoppingCart);
            if (cartList != null && !cartList.isEmpty()) {
                ShoppingCart cart = cartList.get(0);
                if (cart.getNumber() > 1) {
                    // 数量大于1，减少数量
                    cart.setNumber(cart.getNumber() - 1);
                    shoppingCartMapper.updateNumberById(cart);
                } else {
                    // 数量为1，直接删除
                    shoppingCartMapper.deleteBysetmealId(dto.getSetmealId());
                }
            }
        }

    }
}















